Yard is related to Fence as a surrounding boundary. In the same way, Cell is related to which of the following?

Introduction / Context:
This analogy compares boundaries in different contexts. A Yard is an area of land around a house, and a Fence surrounds or encloses it. The question asks for the equivalent enclosing structure for a Cell in biology, which checks basic life science knowledge.

Given Data / Assumptions:
1) A Yard is an open area often enclosed for safety, privacy, or marking property limits.

Concept / Approach:
In the first pair, Fence is the enclosing boundary around the Yard. In biology, the outer boundary that encloses the contents of a Cell is the Cell Membrane, also called the plasma membrane. It separates the cell interior from the external environment. Therefore, Membrane is the structure that plays the same role as Fence does for a Yard.

Step-by-Step Solution:
Step 1: Identify the relationship in Yard : Fence as region and its enclosing boundary. Step 2: Recall the basic parts of a Cell. The Cell Membrane surrounds the Cytoplasm and organelles. Step 3: Examine the options. Mitochondria and Nucleus are internal organelles. Cytoplasm is the fluid interior in which organelles are suspended. Step 4: Membrane is the outer barrier that performs the same enclosing function as a Fence. Step 5: Therefore, the analogy is Cell : Membrane.

Verification / Alternative check:
Think in terms of boundaries. For a yard, we usually talk about building a fence around it. For a cell, we speak about the cell membrane as the protective boundary. We do not say a cell is surrounded by cytoplasm or by mitochondria. These are inside the cell, so they cannot be matched with the idea of an enclosing boundary.

Why Other Options Are Wrong:
Mitochondria are internal energy producing structures, often called the powerhouses of the cell. Cytoplasm is the internal fluid medium that fills the cell and supports organelles. Nucleus is the internal control center containing genetic material. None of these act as the external enclosing structure, so they do not parallel a Fence.

Common Pitfalls:
Some learners may choose Cytoplasm because they remember it surrounds organelles. However, the analogy is specifically about enclosing the entire cell, just as a fence encloses an entire yard. The cell membrane is the structure that separates inside from outside, so it is the best match.

Final Answer:
Thus, Yard is to Fence as Cell is to Membrane. The correct answer is Membrane.